package com.kckj.comm.util;

import com.common.base.Result;
import com.kckj.comm.util.Excel.ColumnType;
import com.kckj.comm.util.Excel.Type;
import com.kckj.comm.validation.AbstractValidationCell;
import com.util.DateConvertUtil;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.ss.util.CellRangeAddressList;
import org.apache.poi.xssf.usermodel.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.*;


/**
 * Excel相关处理
 * 
 */
public class ExcelUtil<T> {
	private static final Logger log = LoggerFactory.getLogger(ExcelUtil.class);

	/**
	 * Excel sheet最大行数，默认65536
	 */
	public static final int sheetSize = 65536;

	/**
	 * 工作表名称
	 */
	private String sheetName;

	/**
	 * 导出类型（EXPORT:导出数据；IMPORT：导入模板）
	 */
	private Type type;

	/**
	 * 工作薄对象
	 */
	private XSSFWorkbook wb;

	/**
	 * 工作表对象
	 */
	private XSSFSheet sheet;

	/**
	 * 样式列表
	 */
	private Map<String, XSSFCellStyle> styles;

	/**
	 * 导入导出数据列表
	 */
	private List<T> list;

	/**
	 * 注解列表
	 */
	private List<Object[]> fields;

	/**
	 * 实体对象
	 */
	public Class<T> clazz;
	
	private String datePath;

	public ExcelUtil(Class<T> clazz) {
		this.clazz = clazz;
	}

	public void init(List<T> list, String sheetName, Type type) throws IOException {
		if (list == null) {
			list = new ArrayList<T>();
		}
		this.list = list;
		this.sheetName = sheetName;
		this.type = type;
		createExcelField();
		createWorkbook();
	}
	public void init(List<T> list, String sheetName, Type type,String datePath) throws IOException {
		if (list == null) {
			list = new ArrayList<T>();
		}
		this.datePath=datePath;
		this.list = list;
		this.sheetName = sheetName;
		this.type = type;
		createExcelField();
		createWorkbook();
	}

	/**
	 * 对excel表单默认第一个索引名转换成list
	 * 
	 * @return 转换后集合
	 */
	public List<T> importExcel(InputStream is, int tableHead, int dataHead, Map<Integer, AbstractValidationCell> vacell) throws Exception {
		return importExcel(StringUtils.EMPTY, is, tableHead,  dataHead, vacell);
	}

	/**
	 * 对excel表单指定表格索引名转换成list
	 * 
	 * @param sheetName 表格索引名
	 * @return 转换后集合
	 */
	/**
	 *
	 * @param sheetName
	 * @param is  流对象
	 * @param tableHead 表头
	 * @param dataHead 数据行头
	 * @param vacell 校验类
	 * @return
	 * @throws Exception
	 */
	public List<T> importExcel(String sheetName, InputStream is, int tableHead, int dataHead, Map<Integer, AbstractValidationCell> vacell) throws Exception {
		this.type = Type.IMPORT;
		this.wb = (XSSFWorkbook) XSSFWorkbookFactory.create(is);
		List<T> list = new ArrayList<T>();
		XSSFSheet sheet = null;
		if (StringUtils.isNotEmpty(sheetName)) {
			// 如果指定sheet名,则取指定sheet中的内容.
			sheet = wb.getSheet(sheetName);
		} else {
			// 如果传入的sheet名不存在则默认指向第1个sheet.
			sheet = wb.getSheetAt(0);
		}

		if (sheet == null) {
			throw new IOException("文件sheet不存在");
		}

		int rows = sheet.getPhysicalNumberOfRows();

		if (rows > 0) {
			// 定义一个map用于存放excel列的序号和field.
			Map<String, Integer> cellMap = new HashMap<String, Integer>();
			// 获取表头
			XSSFRow heard = sheet.getRow(tableHead);
			for (int i = 0; i < heard.getPhysicalNumberOfCells(); i++) {
				XSSFCell cell = heard.getCell(i);
				if (StringUtils.isNotNull(cell != null)) {
					String value = this.getCellValue(heard, i).toString();
					cellMap.put(value, i);
				} else {
					cellMap.put(null, i);
				}
			}
			// 有数据时才处理 得到类的所有field.
			Field[] allFields = clazz.getDeclaredFields();
			// 定义一个map用于存放列的序号和field.
			Map<Integer, Field> fieldsMap = new HashMap<Integer, Field>();
			for (int col = 0; col < allFields.length; col++) {
				Field field = allFields[col];
				Excel attr = field.getAnnotation(Excel.class);
				if (attr != null && (attr.type() == Type.ALL || attr.type() == type)) {
					// 设置类的私有字段属性可访问.
					field.setAccessible(true);
					Integer column = cellMap.get(attr.name());
					fieldsMap.put(column, field);
				}
			}
			for (int i = dataHead; i < rows; i++) {
				// 从第2行开始取数据,默认第一行是表头.
				XSSFRow row = sheet.getRow(i);
				T entity = null;
				for (Map.Entry<Integer, Field> entry : fieldsMap.entrySet()) {
					if(entry.getKey() != null){
						Object val = this.getCellValue(row, entry.getKey());

						// 如果不存在实例则新建.
						entity = (entity == null ? clazz.newInstance() : entity);
						// 从map中得到对应列的field.
						Field field = fieldsMap.get(entry.getKey());
						// 取得类型,并根据对象类型设置值.
						Class<?> fieldType = field.getType();
						if(vacell != null){
							AbstractValidationCell validationCell = vacell.get(entry.getKey());
							if(validationCell != null){
								validationCell.validateCell(i, val);
							}
						}
						if (String.class == fieldType) {
							String s = Convert.toStr(val);
							if (StringUtils.endsWith(s, ".0")) {
								val = StringUtils.substringBefore(s, ".0");
							} else {
								val = Convert.toStr(val);
							}
						} else if ((Integer.TYPE == fieldType) || (Integer.class == fieldType)) {
							val = Convert.toInt(val);
						} else if ((Long.TYPE == fieldType) || (Long.class == fieldType)) {
							val = Convert.toLong(val);
						} else if ((Double.TYPE == fieldType) || (Double.class == fieldType)) {
							val = Convert.toDouble(val);
						} else if ((Float.TYPE == fieldType) || (Float.class == fieldType)) {
							val = Convert.toFloat(val);
						} else if (BigDecimal.class == fieldType) {
							val = Convert.toBigDecimal(val);
						} else if (Date.class == fieldType) {
							if (val instanceof String) {
								val = DateUtils.parseDate(val);
							} else if (val instanceof Double) {
								val = DateUtil.getJavaDate((Double) val);
							}
						}
						if (StringUtils.isNotNull(fieldType)) {
							Excel attr = field.getAnnotation(Excel.class);
							String propertyName = field.getName();
							if (StringUtils.isNotEmpty(attr.targetAttr())) {
								propertyName = field.getName() + "." + attr.targetAttr();
							} else if (StringUtils.isNotEmpty(attr.readConverterExp())) {
								val = reverseByExp(String.valueOf(val), attr.readConverterExp());
							}
							ReflectUtils.invokeSetter(entity, propertyName, val);
						}
					}
				}
				list.add(entity);
			}
		}
		return list;
	}

	/**
	 * 对list数据源将其里面的数据导入到excel表单
	 * 
	 * @param list      导出数据集合
	 * @param sheetName 工作表的名称
	 * @return 结果
	 */
	public Result exportExcel(HttpServletResponse response, List<T> list, String sheetName) throws IOException {
		this.init(list, sheetName, Type.EXPORT);
		return exportExcel(response);
	}
	public Result exportExcel(HttpServletResponse response, List<T> list, String sheetName, String datePath) throws IOException {
		this.init(list, sheetName, Type.EXPORT,datePath);
		return exportExcel(response);
	}

	public XSSFWorkbook getWorkbook(List<T> list) throws IOException {
		this.init(list, "Sheet1", Type.EXPORT);
		return (XSSFWorkbook) getWorkbook();
	}

	/**
	 * 对list数据源将其里面的数据导入到excel表单
	 *
	 * @param sheetName 工作表的名称
	 * @return 结果
	 */
	public Result importTemplateExcel(HttpServletResponse response, String sheetName) throws IOException {
		this.init(null, sheetName, Type.IMPORT);
		return exportExcel(response);
	}

	/**
	 * 对list数据源将其里面的数据导入到excel表单
	 *
	 * @return 结果
	 */
	public Result exportExcel(HttpServletResponse response) {
		OutputStream out = null;
		try {
			// 取出一共有多少个sheet.
			double sheetNo = Math.ceil(list.size() / sheetSize);
			for (int index = 0; index <= sheetNo; index++) {
				createSheet(sheetNo, index);

				// 产生一行
				XSSFRow row = sheet.createRow(0);
				int column = 0;
				// 写入各个字段的列头名称
				for (Object[] os : fields) {
					Excel excel = (Excel) os[1];
					this.createCell(excel, row, column++);
				}
				if (Type.EXPORT.equals(type)) {
					fillExcelData(index, row);
				}
			}
			long timestamp = DateConvertUtil.convertDateToLongTimestamp(new Date());
			String filename = timestamp+sheetName+".xlsx";
			filename = new String(filename.getBytes("GBK"), "iso8859-1");
//			out = new FileOutputStream(getAbsoluteFile(filename));
//			out = new FileOutputStream(filename);

				OutputStream output = null;
				BufferedOutputStream bufferedOutPut = null;
				response.reset();
				response.setHeader("Content-Disposition", "attachment;filename=" + filename);// 指定下载的文件名
				response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
				response.setHeader("Pragma", "no-cache");
				response.setHeader("Cache-Control", "no-cache");
				response.setDateHeader("Expires", 0);
				output = response.getOutputStream();
				wb.write(output);
				return Result.success(filename);
		} catch (Exception e) {
			log.error("导出Excel异常{}", e.getMessage());
			throw new RuntimeException("导出Excel失败，请联系网站管理员！");
		} finally {
			if (wb != null) {
				try {
					wb.close();
				} catch (IOException e1) {
					e1.printStackTrace();
				}
			}
			if (out != null) {
				try {
					out.close();
				} catch (IOException e1) {
					e1.printStackTrace();
				}
			}
		}
	}

	/**
	 * 填充excel数据
	 *
	 * @param index 序号
	 * @param row   单元格行
	 */
	public void fillExcelData(int index, XSSFRow row) {
		int startNo = index * sheetSize;
		int endNo = Math.min(startNo + sheetSize, list.size());
		for (int i = startNo; i < endNo; i++) {
			row = (XSSFRow) sheet.createRow(i + 1 - startNo);
			// 得到导出对象.
			T vo = (T) list.get(i);
			int column = 0;
			for (Object[] os : fields) {
				Field field = (Field) os[0];
				Excel excel = (Excel) os[1];
				// 设置实体类私有属性可访问
				field.setAccessible(true);
				this.addCell(excel, row, vo, field, column++);
			}
		}
	}

	/**
	 * 创建表格样式
	 *
	 * @param wb 工作薄对象
	 * @return 样式列表
	 */
	private Map<String, XSSFCellStyle> createStyles(XSSFWorkbook wb) {
		// 写入各条记录,每条记录对应excel表中的一行
		Map<String, XSSFCellStyle> styles = new HashMap<String, XSSFCellStyle>();
		XSSFCellStyle style = wb.createCellStyle();
		style.setAlignment(HorizontalAlignment.CENTER);
		style.setVerticalAlignment(VerticalAlignment.CENTER);
		style.setBorderRight(BorderStyle.THIN);
		style.setRightBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
		style.setBorderLeft(BorderStyle.THIN);
		style.setLeftBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
		style.setBorderTop(BorderStyle.THIN);
		style.setTopBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
		style.setBorderBottom(BorderStyle.THIN);
		style.setBottomBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
		Font dataFont = wb.createFont();
		dataFont.setFontName("Arial");
		dataFont.setFontHeightInPoints((short) 10);
		style.setFont(dataFont);
		styles.put("data", style);

		style = wb.createCellStyle();
		style.cloneStyleFrom(styles.get("data"));
		style.setAlignment(HorizontalAlignment.CENTER);
		style.setVerticalAlignment(VerticalAlignment.CENTER);
		style.setFillForegroundColor(IndexedColors.GREY_50_PERCENT.getIndex());
		style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
		Font headerFont = wb.createFont();
		headerFont.setFontName("Arial");
		headerFont.setFontHeightInPoints((short) 10);
		headerFont.setBold(true);
		headerFont.setColor(IndexedColors.WHITE.getIndex());
		style.setFont(headerFont);
		styles.put("header", style);

		return styles;
	}

	/**
	 * 创建单元格
	 */
	public XSSFCell createCell(Excel attr, XSSFRow row, int column) {
		// 创建列
		XSSFCell cell = row.createCell(column);
		// 写入列信息
		cell.setCellValue(attr.name());
		setDataValidation(attr, row, column);
		cell.setCellStyle(styles.get("header"));
		return cell;
	}

	/**
	 * 设置单元格信息
	 *
	 * @param value 单元格值
	 * @param attr  注解相关
	 * @param cell  单元格信息
	 */
	public void setCellVo(Object value, Excel attr, XSSFCell cell) {
		if (ColumnType.STRING == attr.cellType()) {
			cell.setCellType(CellType.NUMERIC);
			cell.setCellValue(StringUtils.isNull(value) ? attr.defaultValue() : value + attr.suffix());
		} else if (ColumnType.NUMERIC == attr.cellType()) {
			cell.setCellType(CellType.NUMERIC);
			cell.setCellValue(Integer.parseInt(value + ""));
		}
	}

	/**
	 * 创建表格样式
	 */
	public void setDataValidation(Excel attr, XSSFRow row, int column) {
		if (attr.name().indexOf("注：") >= 0) {
			sheet.setColumnWidth(column, 6000);
		} else {
			// 设置列宽
			sheet.setColumnWidth(column, (int) ((attr.width() + 0.72) * 256));
			row.setHeight((short) (attr.height() * 20));
		}
		// 如果设置了提示信息则鼠标放上去提示.
		if (StringUtils.isNotEmpty(attr.prompt())) {
			// 这里默认设了2-101列提示.
			setXSSFPrompt(sheet, "", attr.prompt(), 1, 100, column, column);
		}
		// 如果设置了combo属性则本列只能选择不能输入
		if (attr.combo().length > 0) {
			// 这里默认设了2-101列只能选择不能输入.
			setXSSFValidation(sheet, attr.combo(), 1, 100, column, column);
		}
	}

	/**
	 * 添加单元格
	 */
	public XSSFCell addCell(Excel attr, XSSFRow row, T vo, Field field, int column) {
		XSSFCell cell = null;
		try {
			// 设置行高
			row.setHeight((short) (attr.height() * 20));
			// 根据Excel中设置情况决定是否导出,有些情况需要保持为空,希望用户填写这一列.
			if (attr.isExport()) {
				// 创建cell
				cell = row.createCell(column);
				cell.setCellStyle(styles.get("data"));

				// 用于读取对象中的属性
				Object value = getTargetValue(vo, field, attr);
				String dateFormat = attr.dateFormat();
				String readConverterExp = attr.readConverterExp();
				if (StringUtils.isNotEmpty(dateFormat) && StringUtils.isNotNull(value)) {
					cell.setCellValue(DateUtils.parseDateToStr(dateFormat, (Date) value));
				} else if (StringUtils.isNotEmpty(readConverterExp) && StringUtils.isNotNull(value)) {
					cell.setCellValue(convertByExp(String.valueOf(value), readConverterExp));
				} else {
					// 设置列类型
					setCellVo(value, attr, cell);
				}
			}
		} catch (Exception e) {
			log.error("导出Excel失败{}", e);
		}
		return cell;
	}

	/**
	 * 设置 POI XSSFSheet 单元格提示
	 *
	 * @param sheet         表单
	 * @param promptTitle   提示标题
	 * @param promptContent 提示内容
	 * @param firstRow      开始行
	 * @param endRow        结束行
	 * @param firstCol      开始列
	 * @param endCol        结束列
	 */
	public void setXSSFPrompt(XSSFSheet sheet, String promptTitle, String promptContent, int firstRow, int endRow,
                              int firstCol, int endCol) {
		DataValidationHelper helper = sheet.getDataValidationHelper();
		DataValidationConstraint constraint = helper.createCustomConstraint("DD1");
		CellRangeAddressList regions = new CellRangeAddressList(firstRow, endRow, firstCol, endCol);
		DataValidation dataValidation = helper.createValidation(constraint, regions);
		dataValidation.createPromptBox(promptTitle, promptContent);
		dataValidation.setShowPromptBox(true);
		sheet.addValidationData(dataValidation);
	}

	/**
	 * 设置某些列的值只能输入预制的数据,显示下拉框.
	 *
	 * @param sheet    要设置的sheet.
	 * @param textlist 下拉框显示的内容
	 * @param firstRow 开始行
	 * @param endRow   结束行
	 * @param firstCol 开始列
	 * @param endCol   结束列
	 * @return 设置好的sheet.
	 */
	public void setXSSFValidation(XSSFSheet sheet, String[] textlist, int firstRow, int endRow, int firstCol, int endCol) {
		DataValidationHelper helper = sheet.getDataValidationHelper();
		// 加载下拉列表内容
		DataValidationConstraint constraint = helper.createExplicitListConstraint(textlist);
		// 设置数据有效性加载在哪个单元格上,四个参数分别是：起始行、终止行、起始列、终止列
		CellRangeAddressList regions = new CellRangeAddressList(firstRow, endRow, firstCol, endCol);
		// 数据有效性对象
		DataValidation dataValidation = helper.createValidation(constraint, regions);
		// 处理Excel兼容性问题
		if (dataValidation instanceof XSSFDataValidation) {
			dataValidation.setSuppressDropDownArrow(true);
			dataValidation.setShowErrorBox(true);
		} else {
			dataValidation.setSuppressDropDownArrow(false);
		}

		sheet.addValidationData(dataValidation);
	}

	/**
	 * 解析导出值 0=男,1=女,2=未知
	 *
	 * @param propertyValue 参数值
	 * @param converterExp  翻译注解
	 * @return 解析后值
	 * @throws Exception
	 */
	public static String convertByExp(String propertyValue, String converterExp) throws Exception {
		try {
			String[] convertSource = converterExp.split(",");
			for (String item : convertSource) {
				String[] itemArray = item.split("=");
				if (itemArray[0].equals(propertyValue)) {
					return itemArray[1];
				}
			}
		} catch (Exception e) {
			throw e;
		}
		return propertyValue;
	}

	/**
	 * 反向解析值 男=0,女=1,未知=2
	 *
	 * @param propertyValue 参数值
	 * @param converterExp  翻译注解
	 * @return 解析后值
	 * @throws Exception
	 */
	public static String reverseByExp(String propertyValue, String converterExp) throws Exception {
		try {
			String[] convertSource = converterExp.split(",");
			for (String item : convertSource) {
				String[] itemArray = item.split("=");
				if (itemArray[1].equals(propertyValue)) {
					return itemArray[0];
				}
			}
		} catch (Exception e) {
			throw e;
		}
		return propertyValue;
	}

	/**
	 * 编码文件名
	 */
	public String encodingFilename(String filename) {
		filename = UUID.randomUUID().toString() + "_" + filename + ".xlsx";
		return filename;
	}

	/**
	 * 获取下载路径
	 *
	 * @param filename 文件名称
	 */
	public String getAbsoluteFile(String filename) {
		String downloadPath = datePath == null ?"./"+ filename:datePath + filename;
		File desc = new File(downloadPath);
		if (!desc.getParentFile().exists()) {
			desc.getParentFile().mkdirs();
		}
		return downloadPath;
	}

	/**
	 * 获取bean中的属性值
	 *
	 * @param vo    实体对象
	 * @param field 字段
	 * @param excel 注解
	 * @return 最终的属性值
	 * @throws Exception
	 */
	private Object getTargetValue(T vo, Field field, Excel excel) throws Exception {
		Object o = field.get(vo);
		if (StringUtils.isNotEmpty(excel.targetAttr())) {
			String target = excel.targetAttr();
			if (target.indexOf(".") > -1) {
				String[] targets = target.split("[.]");
				for (String name : targets) {
					o = getValue(o, name);
				}
			} else {
				o = getValue(o, target);
			}
		}
		return o;
	}

	/**
	 * 以类的属性的get方法方法形式获取值
	 *
	 * @param o
	 * @param name
	 * @return value
	 * @throws Exception
	 */
	private Object getValue(Object o, String name) throws Exception {
		if (StringUtils.isNotEmpty(name)) {
			Class<?> clazz = o.getClass();
			String methodName = "get" + name.substring(0, 1).toUpperCase() + name.substring(1);
			Method method = clazz.getMethod(methodName);
			o = method.invoke(o);
		}
		return o;
	}

	/**
	 * 得到所有定义字段
	 */
	private void createExcelField() {
		this.fields = new ArrayList<Object[]>();
		List<Field> tempFields = new ArrayList<>();
		tempFields.addAll(Arrays.asList(clazz.getSuperclass().getDeclaredFields()));
		tempFields.addAll(Arrays.asList(clazz.getDeclaredFields()));
		for (Field field : tempFields) {
			// 单注解
			if (field.isAnnotationPresent(Excel.class)) {
				putToField(field, field.getAnnotation(Excel.class));
			}

			// 多注解
			if (field.isAnnotationPresent(Excels.class)) {
				Excels attrs = field.getAnnotation(Excels.class);
				Excel[] excels = attrs.value();
				for (Excel excel : excels) {
					putToField(field, excel);
				}
			}
		}
	}

	/**
	 * 放到字段集合中
	 */
	private void putToField(Field field, Excel attr) {
		if (attr != null && (attr.type() == Type.ALL || attr.type() == type)) {
			this.fields.add(new Object[] { field, attr });
		}
	}

	/**
	 * 创建一个工作簿
	 */
	public void createWorkbook() throws IOException {
//		this.wb = new XSSFWorkbook(String.valueOf(500));
		this.wb = new XSSFWorkbook();
	}

	/**
	 * 创建工作表
	 *
	 * @param sheetNo sheet数量
	 * @param index   序号
	 */
	public void createSheet(double sheetNo, int index) {
		this.sheet = wb.createSheet();
		this.styles = createStyles(wb);
		// 设置工作表的名称.
		if (sheetNo == 0) {
			wb.setSheetName(index, sheetName);
		} else {
			wb.setSheetName(index, sheetName + index);
		}
	}

	/**
	 * 获取单元格值
	 *
	 * @param row    获取的行
	 * @param column 获取单元格列号
	 * @return 单元格值
	 */
	public Object getCellValue(XSSFRow row, int column) {
		if (row == null) {
			return row;
		}
		Object val = "";
		try {
			XSSFCell cell = row.getCell(column);
			if (cell != null) {
				if (cell.getCellTypeEnum() == CellType.NUMERIC || cell.getCellTypeEnum() == CellType.FORMULA) {
					val = cell.getNumericCellValue();
					if (HSSFDateUtil.isCellDateFormatted(cell)) {
						val = DateUtil.getJavaDate((Double) val); // POI Excel 日期格式转换
					} else {
						if ((Double) val % 1 > 0) {
							val = new DecimalFormat("0.00").format(val);
						} else {
							val = new DecimalFormat("0").format(val);
						}
					}
				} else if (cell.getCellTypeEnum() == CellType.STRING) {
					val = cell.getStringCellValue();
				} else if (cell.getCellTypeEnum() == CellType.BOOLEAN) {
					val = cell.getBooleanCellValue();
				} else if (cell.getCellTypeEnum() == CellType.ERROR) {
					val = cell.getErrorCellValue();
				}

			}
		} catch (Exception e) {
			return val;
		}
		return val;
	}

	public XSSFWorkbook getWorkbook() {
		// 取出一共有多少个sheet.
		double sheetNo = Math.ceil(list.size() / sheetSize);
		for (int index = 0; index <= sheetNo; index++) {
			createSheet(sheetNo, index);

			// 产生一行
			XSSFRow row = sheet.createRow(0);
			int column = 0;
			// 写入各个字段的列头名称
			for (Object[] os : fields) {
				Excel excel = (Excel) os[1];
				this.createCell(excel, row, column++);
			}
			if (Type.EXPORT.equals(type)) {
				fillExcelData(index, row);
			}
		}
		return wb;
	}





	/**
	 * 获取单元格的值,差异化处理是否为合并单元格。
	 *
	 * @param sheet  表格
	 * @param row    行数
	 * @param column 列数
	 * @return 单元格内容
	 */
	public static String getMergedRegionValue(Sheet sheet, int row, int column) {
		int sheetMergeCount = sheet.getNumMergedRegions();
		try {
			for (int i = 0; i < sheetMergeCount; i++) {
				CellRangeAddress ca = sheet.getMergedRegion(i);

				int firstRow = ca.getFirstRow();
				int lastRow = ca.getLastRow();
				int firstColumn = ca.getFirstColumn();
				int lastColumn = ca.getLastColumn();

				if (row >= firstRow && row <= lastRow) {
					if (column >= firstColumn && column <= lastColumn) {
						Row fRow = sheet.getRow(firstRow);
						Cell fCell = fRow.getCell(firstColumn);
						return getCellFormatValue(fCell);
					}
				} else {
					Row row1 = sheet.getRow(row);
					Cell cell = row1.getCell(column);
					return getCellFormatValue(cell);
				}
			}
		} catch (Exception e) {
			log.error("ExcelUtil -- getMergedRegionValue " + e.getMessage());
		}

		return null;
	}

	/**
	 * 格式化获取单元格的值
	 *
	 * @param cell 单元格
	 * @return
	 */
	public static String getCellFormatValue(Cell cell) {
		String cellValue = null;
		if (cell != null) {
			switch (cell.getCellType()) {
				//如果当前单元格是浮点型数据
				case NUMERIC: {
                    /*
                    且当前单元格风格类型为时间格式
                    14 yyyy-MM-dd / 2017/01/01
                    31 yyyy年m月d日
                    */
					if (cell.getCellStyle().getDataFormat() == 31) {
						Date d = DateUtil.getJavaDate(cell.getNumericCellValue());
						cellValue = new SimpleDateFormat("yyyy-MM-dd").format(d);
					} else {
						cellValue = String.valueOf(cell.getNumericCellValue());
					}
					break;
				}
				case FORMULA: {
					if (DateUtil.isCellDateFormatted(cell)) {
						cellValue = cell.getDateCellValue() + "";
					} else {
						cellValue = String.valueOf(cell.getNumericCellValue());
					}
					break;
				}
				case STRING: {
					cellValue = cell.getRichStringCellValue().getString();
					break;
				}
				case BLANK: {
					cellValue = "";
					break;
				}
				default:
					cellValue = "";
			}
		} else {
			cellValue = "";
		}
		return cellValue;
	}
}